I should elaborate on this after rereading the limit documentation more
carefully. It states:
Return the limit as the variable v approaches a from the given
direction.
expr.limit(x = a)
expr.limit(x = a, dir='above')
INPUT:
* "dir" - (default: None); dir may have the value 'plus' (or '+'
or 'right') for a limit from above, 'minus' (or '-' or 'left')
for a limit from below, or may be omitted (implying a two-sided
limit is to be computed).
The second expression (right before INPUT) seems to imply that the default
value for dir is 'above'. That might explain why Sage hands back Infinity,
but the description of "dir" implies that the default is None.
So I'm totally confused.
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